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# prime numbers

prime numbers are numbers that only have one factor pair itself and one.

by

Tweet## carissa summers

on 7 September 2012#### Transcript of prime numbers

What is a prime number? Prime numbers As an example 11 is a prime number because it only has one factor pair. A prime number is a number that only has one factor pair. For example What is a factor pair? A factor pair is two numbers that you multiply together to get another number. What makes a prime number a prime number is it only has one factor pair. Are any of these numbers prime? NOPE 175 NOPE 137 YEA 49 NOPE 22 22 is not a prime number because the factors are1,2,11,22. 175 is not a prime number because it ends in a five and if it ends in a 0 or 5 then we know that it is a multiple of five. 137 is a prime number because the only factors are 1 and 137. 49 is not a prime number because the factors are 1,7, and 49. THE END !

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